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MAGNETIC BRUSH CONFIGURATION FOR USE WITH HIGH-CONDUCTIVITY DEVELOPERS

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is a magnetic brush configuration, which permits developer conductivity to range over a wide latitude. The configuration is comprised of a conventional magnetic brush roller 1, which develops the bulk of-the electrostatic latent image on the photoreceptor 4, particularly solid areas, a field-free magnetic brush 2, which develops gradients thereby enhancing low-density lines, and a pick-off element 3, which scavages carrier beads that may be left by the field-free magnetic brush.

Country

Undisclosed

Language

English (United States)

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Disclosed is a magnetic brush configuration, which permits developer conductivity to range over a wide latitude. The configuration is comprised of a conventional magnetic brush roller 1, which develops the bulk of- the electrostatic latent image on the photoreceptor 4, particularly solid areas, a field-free magnetic brush 2, which develops gradients thereby enhancing low-density lines, and a pick-off element 3, which scavages carrier beads that may be left by the field-free magnetic brush.

One method of accomplishing the above is outlined in the drawing. In the drawing, magnetic poles are indicated by dashes 5. An "against-with" configuration is illustrated where the pick-off element is a rotating closed, spaced roller 1 with a strong, stationary internal magnet. A sleeveless magnetic brush (a rotating magnet) could be used instead combined with a blade or pad for removing beads. Also shown is an optional vibrator 6 situated on the opposite side of the photoreceptor. In the event the magnetic force of the pick-off roller is insufficient to release all beads, the photoreceptor could be vibrated at a high frequency to aid release. A paddle wheel 7 is used to transport developer from a sump (not shown) to the rollers 1 and 2.